If your planning on building a case out of plexiglass, be prepared to do a lot of grounding. Plexiglass can hold a charge on its surface (like static electricity) and can short out components if its not grounded correctly.

I personally haven't had much luck getting small sheets for what I need. Most hardware stores carry plexi but its not only thick but pretty expensive. Got some 1/8" sheets at Curry's. Not the greatest price but at least it's a manageable size. Think Michael's carries some too but haven't ever found a store thats had it in stock. Bit off topic but has anyone ever tried to use the plastic covering picture frames at like Canadian Tire for a window? Funny thing is how some cheap frames are cheaper than buying a sheet of plexi